It's quite possible that over the years your son hasn't been placed in classrooms where he would have anything to learn, so that if his WISC is very high, his WIAT might reflect that he has learned less than what another kid with the same WISC who had been in classrooms that matched that theoretical child's readiness to learn level.
Another class situation where the WISC is higher than the WIAT is ADD/ADHD, presumably because the disability interferes with the child's ability to learn to their fullness of what their WISC would suggest.
Do either of these seem likely?
It also matters what the difference is - is it half a standard deviation, or 3 SD?
love and more love,
Grinity
